Clamp-On Ultrasonic Flowmeter for Cement Lined Pipe

The more "lumpy" the fluid is, the better an ultrasonic meter will work; those lumps could be solids or bubbles, it doesn't matter.

There is some experience here of using them on ultrapure water (<1ppb impurities) in PVDF pipes.

_{<ducks the question on cement-lined pipe>}

I'll say - the unbonded version with an ultrasonic detector is the basis for determining when an oil or gas well casing is not correctly cemented. The return signal on unbonded pipe is just the pipe ringing - you would get that same effect here. With the pipe bonded to cement you get what's behind the pipe in a well, and what's inside in this case. (I ran such an instrument for 11 years in the oil field.)

The former Controlatron, now Siemens, clamp-on ultrasonic flow meters (FUS 1010 models) can work on lined pipe if the lining has not separated or unbonded from the metal pipe.

Siemens best fit is transit time ultrasonics that do NOT want suspended anything (particles or bubbles) in the fluid. The cleaner the fluid, the better for transmit time. Doppler ultrasonic technology requires suspended stuff, but transit time is just the opposite. Siemens does have doppler transducers, but with nowhere near the accuracy of their transit time siblings.